Equipment for grinding brake-shoe lining sections



I May 27, 1947. H. B. BARRETT EQUIPMENT FOR GRINDING BRAKE-SHOE LINING-SECTIONS Filed March 25, 1944 2 Sheets-Sheet l May 27,1947. B E' 2,421,180

EQUIPMENT FOR GRINDING BRAKE-SHOE LINING-SECTIONS Filed March 25, 1944 2 Sheets- Sheet 2 A r-reveals).

Patented May 27, 1947 UNITED STATES PATENTS? OFFICE EQUIPMENT FOR GRINDING B AKE-snort, INWG QT QNV Harry B. Barrett, Ladue, Mo. 7

Application March 25, 1944, Serial No, 528,933

8 Claims. (01. 51-424);

is relatively simple, compact, durable, and rigid in structure, which is readily portable, which is conveniently operable, and which is efficient in the performance of its intended functions.

And with the above and other objects in View, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claims.

In the accompanying drawings (two sheets)- Figure 1 is a front elevational view of grindingequipment constructed in accordance with and embodying my present invention;

Figure 2 is a rear eleva'tional view of such.

equipment;

Figure 3 is a side elevational view of theequipe ment, looking in the direction of the arroweline 3-3 Figure 1;

Figures 4 and 5 are enlarged detail sectional views taken approximately on the line 4-4, Figure 3, and on the line 5-'-5', Figure 4, respectively;

Figure 6 is a view similar toFigure 5, illustrating, .however, a gauge of the equipment in a swung position for facilitating the mounting. or remounting of a brake-shoe or other work;

Figure '7 is an elevational view, illustrating the co-operation of a caliper withv the equipment for transferring thereto certain brake-shoe dimen sions Figure 8 is an elevational view, illustrating the grinding association with the 'e quipm'ent .of a brake-shoe. assembly;

Figure 9 is an enlarged transverse sectional.

view of a preferred form of jig for associating a brake-shoe assembly or other work with the equipment;

Figure 10 is an elevational view of a grinder assembly preferably forming part ofpthev equipmenu. l a

Figure 11 is an elevational view of a slightly modified jig especially adapted for mounting a fragmentalbrake-shoe assembly upon'the stand of the equipment for a grinding operation; and

Figure 12 is an elevational view, illustrating,

2 as in Figure 8, the grinding association with the equipment of a fragmental brake-shoe assembly.

Referring now more in detail and by reference characters to the. drawings, which illustrate practical embodiments of my invention, the equipment includes a suitable rigid standard or, as it may be designated, pedestal A adapted for mounting upon, and attachment to, a machine floor or other foundation B.

Preferably, asat I, Figure 3, detachably seated at its lower end in, and vertically upstanding from, the pedestal A, is a staff C, upon which, for selective adjustment with respect to pedestal A, is mounted a gauge-assembly D, which latter, as best seen in Figures 4, 5, and 6, comprises a block 2' having a bore slidably fitting the staff C and equipped with a set-screw or the like 3 for securing the block 2 in selected location or adjustmentupon the staff C;

Pivote-d, as at 4', to swing on and relatively to theblock '2, is a bracket-arm 5 having, for purposes presently appearing, preferably the form and contour best seen in Figures 4, 5, and 6, and formingbpart of, and projecting laterally'from, the arm'5, is a tubular or channeled portion 6, through which freely extends a bar 1 for mounting an indicator-gauge E co-operably comprising a yielding or spring-pressed finger or stem 8, a pointer 9, and an annular series of graduations I0, the barf! and its supported indicator E being secured in adjusted locations with respect to the block 2 and arin 5 as by means of a set-screw or the like I l,as best seen in Figures 4, 5, and 6.

Projecting rearwardly from the block 2 under the cut-away lower corner of arm 5, is an apertured ear IZ- adjustably seating the threaded shank l3 of a screw l4 adapted for engagement at the free end of its shank I3 with the portion 6 of arm 5 for yieldingly supporting the arm 5 and attached gauge D,under the pull of a spring I5 attached at its endsto studs IS, IS, fixed on the block 2 and arm 5, during grinding operations.

Fixed upon and projecting rearwardly from i the. rear face of, the pedestal A, is a cylindrical memberor hub F, and fixed upon, and'fprojecting forwardly from the opposite or front'face of, the pedestal A and concentrically disposed with respect to the hub F, is a shaft G, upon which latter, for purposespresently appearing, is adjustably disposed a collar l'l.

Preferably usable and co-operable with the pedestal A andlorming substantially a part of the present equipment, is a grinder assembly I-I here separately shown in Figure 10} Such as ward end is a head-casing 19 supporting for adjustment a prime mover 2d. Adjustably shiftable upon and along the rods I8, is a casting 2! having a set-screw or the like 22 for engagement with one of the rods H! for detachably securing 4 a bore 44' for fitting the shaft G for measurement transference.

Now, assume that a grinding assembly H is suitably mounted at its hub 24 upon the pedestal-hub F, that the caliper K has taken and been set to transfer the diametrical dimension of a particular brake-drum, and that the lining-sections 33 of such brake-shoe assembly I are to be surface ground for braking engagement with such calipered drum. The caliper K is accordingly mounted at its frame 44 on the shaft G, as illus- 'trated in Figure 7, whereupon the assembly D is suitably adjusted on and along the staff C for engaging the stem 8 with a bar 42 of caliper K the head 2| in selected locationtherealong; Provided with laterally projecting bosses and fixed to the casting 2|, as by means of bolts 23 engaging the bosses 25, is a split collar or bearing hub 24 having a pair of opposed clamping ears 26 drawn together by a conventional clamp-screw 21, for detachably mounting the assembly H on the hub F, for purposes presently appearing.

Suitably mounted upon the rods [8 and having adjustable connection with the hub-casting 2|, as in said Letters Patent fully shown and described, is a threaded member adapted for actuation as by means of a gauge-wheel 28 and its hande 29 for adjusting the relative location of the hub-casting2l along the rods l8.

1', Figures 8 and 9, indicates a brake-shoe assembly of preferablyairplane type, which, as is Well known'in theindustry, comprises a pair of segmental-members 30 having a central hub 31 and rims 32, the latter supporting lining-sections 33 'and being suitably connected for expanding relation for impingingly or frictionally engaging a surrounding drum, not here shown, and it may be here stated that, as is likewise Well known, themembers 3|] should be so relatively disposed and the lining-sections 33 should have such thickness that, for efficient engagement with such surrounding drum, the members 30 shall, at their carried lining-sections 33, suitably and evenly engage with and upon the inner arcuate face of the drum. g i

Forming part of the equipment, is a jig J, which is uniquely constructed for-supporting a brake-shoe assembly I connection with the stand or pedestal A, and which accordingly comprises alsleeve 34 provided at its one or forward end with ahead, asat 35, and a plurality-of handle-inembers '38 projecting preferably obliquely outwardly and forwardly from the head 35, the sleeve-33 being externally threaded at its rear end, as at 31, for receiving a clamping nut 38. She sleeve 34 is diametrically sized for fitting the shaft G and'is shouldered, as at 39, to seat the outer'ring 48 of a pair of selected companion aaapter-nng m '4 the outer ring being externall'y sized for fitting the hub- 3I andthe inner ring it-being clampingly interposed'btween the nut 38 and the hub-portion 3i,

Also co-operable with the present equipment, is a caliper K, for a full description or specificationof which reference is also made to said Letters Patent. Suffice, for present purposes, to say that caliper K comprises a pair of opposed stems or contact-bars 42 adapted for facile adjustment for measuring the inside diametrical dimension of a drum or other oircular or annular surface, a threaded member 43 for effecting adjustments of'thebars 42, anda frame 44 having for transferring such drum radius dimension to the gauge-assembly D and its indicator E, the block 2 being adjusted along staff C until the stem 8 is in such engagement with the adjacent caliper bar 42 that the pointer 9 registers 0 or other selected location on the dial Ill.

'The caliper K may also, it may be here remarked and as will be clear, be rotarily'shifted for enabling, through adjustment of rods i8 relatively tothe castingil, precise location relatively to such drum dimension of the grinder-disc 45 of the motor 26.

The caliper K being removed from shaft G, a setlof adapter-rings 48, 4|, and an intermediate brake-shoeass'embly'l are disposed, and by means of a nut 38 clampingly secured, on a sleeve 34, and thejig J at its sleeve 34 slidably mounted on the shaft G with the inner end of the sleeve 34 abutting the collar H, which had been previously adjustably located in proper or selected position therealong.

With grinding machine H, assembly I, and jig J so conveniently and co-operably mounted on'the pedestal A th e lining-sections 33 are presented for accurate and precise surface grinding by the (rotating abrading disc 45 of motor 28, the opera- 'tor then, by means of the handles 35, readily required by reason of the width, and for grinding the entire exposed surface, of the lining-sections 33 I, v j

"Ihusthe lining-sections 33 may with ease, convenience, and rapidity be surface ground to the required accurate, precise degree for eflicient braking" engagement, when mounted on the airplane, withthe surrounding drum. Imay add that, a particular grinding'operation being concluded, the jig J and assembly I may, with equal ease, eaveair e and rap be e' 'oun d from the standA', theg'auge D, indicator E, and assembly B being, adjusted with facility to meet thegrequirements of respective grinding operations; l lnight further add that frequently merely a single brake-shoe member, such, for example, as the member I, as seen in Figure 12,'is presented for lir1 ing grinding, such member Ycomprising a lining-supporting. segmental rim/$2 having a pivot-opening iii at one end and a foot i? atits opposite end. For readily detachably mounting sucha brakeshpe member I. upo n the. standard A, a jig Jfgas isshown in Figure 11, is preferably employed, the jig J comprising a cross-plate or;

strippdi} having annofi-set foot-rest 49 at one end,,outwardly presented handles 36' at its oppositelend, and a centrally disposedsleeve 35'. As showninFigure 12, the shoe I is engaged at its opening. 48 with a-handle 36", its foot 47 rested on the support 49, and detachably, as by a spring 50, secured to the body-strip 48. The assembled shoe I and jig J may then at the sleeve 34' be easily mounted for lining grinding at the stand-shaft G, as shown.

Normally, as has been stated, the gauge-arm is yieldingly retained by means of the spring l5 upon the adjusting screw 14. However, as shown in Figure 6, the gauge-bar 1 and supported indicator E may be readily lifted and swung from the screw Ill for facilitating the mounting and demounting of a shoe-assembly I or I, the spring 15, in such event, being shifted to the other side of the pivot A and then equally functioning in yieldingly retaining the bar 1 and its associated parts in such swung position.

The equipment fulfills in every respect the objects stated, and it should be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the equipment may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. Grinding equipment including a pedestal, a hub on the pedestal, a grinder on the hub, a shaft on the pedestal concentric with the hub for mounting a lined brake-shoe on the pedestal for lining grinding by the supported grinder, and a gauge on the pedestal having a contactor finger which is radially disposed in relation to the shaft for indicating brake-drum measurement during grinding operation.

2. Grinding equipment including, in combination with a pedestal having a projecting shaft, a jig having means comprising a cross-plate having outwardly presented handles at its opposite ends and an offset foot-rest at an end for engaging a brake-shoe for mounting and manipulating the particular brake-shoe on the shaft for lining grinding, said jig further having a centrally disposed collar for engagement with the shaft, and grinder means mounted on the projecting shaft.

3. Grinding equipment comprising a pedestal having an outwardly projecting shaft, a hub mounted on the shaft, a frame slidably mounted on the hub and extending transversely outwardly therefrom at 90 to the shaft, means for shifting the frame transversely to any selected position of adjustment, a grinder mounted on the frame with its grinding face parallel to the shaft, a jig rotatably mounted on the shaft having shoe-engaging means for holding a brake-shoe upon the jig in accurately concentric relation to the shaft,

a rod extending outwardly from the pedestal, a

support member slidably mounted on the rod for movement radially toward and away from the brake-shoe, and an indicator gauge mounted on the support, said gauge having a dial, an indicating needle, and a spring-pressed actuating plunger adapted for continuous contact at its lower end with the surface of the brake-shoe during grinding operation.

4. A brake-grinding standard including, in combination, .a pedestal having a projecting shaft, a jig having means comprising a cross-plate having outwardly presented handles at its opposite ends and a centrally disposed collar for engage- 6 ment with the shaft, and an offset foot-rest formed at an end of the cross-plate for engaging a brake shoe for holding said brake shoe to permit manipulation thereof about the shaft during grinding and repairing operations.

5. A brake-grinding standard including, in combination, a pedestal having a projecting shaft, a jig comprising a cross-plate having outwardly presented handle means and a collar adapted for rotative disposition upon the shaft, and shoe engagement means on the cross-plate for holding a brake shoe to permit manipulation thereof about the shaft during grinding and repairing operations.

6. Grinding equipment including a pedestal, a shaft mounted in and projecting through the pedestal, a staff mounted in the pedestal and projecting therefrom at right angles to the shaft, a grinder mounted on one projecting end of the shaft, and a jig including a block adjustable along the staff radially in relation to the shaft, said jig comprising an indicator swingable relatively to the block and the shaft for movement into and out of operative position.

7. Grinding equipment including a pedestal, a shaft mounted in and projecting through the pedestal, a stafi mounted in the pedestal and projecting therefrom at right angles to the shaft, a grinder mounted on one projecting end of the shaft, a block slidably mounted on the staff for adjustment radially in relation to the shaft, a bar swingably mounted on said block and projecting outwardly therefrom, said bar being adapted to be swung into a position approximately parallel to the shaft, and an indicator gauge mounted upon said bar.

8. Grinding equipment including a pedestal, a shaft mounted in and projecting through the pedestal, a staff mounted in the pedestal and projecting therefrom at right angles to the shaft, a grinder mounted on one projecting end of the shaft, a block slidably mounted on the staff for adjustment radially in relation to the shaft, said block being provided with stop abutment means, an arm pivotally mounted upon the block, a toggle spring mounted swingably at one end upon the block and swingably at its other end upon the arm for optionally holding the arm in position against the stop abutment means or in upwardly swung position away from the stop abutment means, a bar shiftably mounted in and carried by the arm, and an indicator gauge mounted upon the bar.

HARRY B. BARRETT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,918,020 Dodge July 11, 1933 2,031,357 Barrett Feb. 18, 1936 1,919,545 Fisher July 25,, 1933 2,140,580 I-Iatchman Dec. 20, 1938 1,913,734 Statz June 13, 1933 2,187,962 Barrett Jan. 23, 1940 2,328,650 Johnson et al Sept. 7, 19 13 

